Actor Sho Aikawa used to be the king of straight-to-video movies. He’s now all over the place, and stars as officer Ken Kobayashi in the occasional mystery series, “Setagaya Chuzai Keiji” (“Setagaya Police Substation Detective”; TBS, Mon., 9 p.m.).

Kobayashi was an elite detective in the Metropolitan Police Force, but a traumatic incident prompted him to request a transfer. Now he’s just a beat cop, though one who is still called upon to use his powers of deduction. When the vice president of a local machinery company is stabbed to death in a nearby park, Kobayashi interrogates the victim’s terminally ill father, the president of the company.

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